Question

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4.

Answer 1

If x varies directly as y, then x/y will be a constant.

So, x/y = 7.5/10 = x/4

So, 10*x = 7.5*4

x = 30/10 = 3

x will be 3 when y = 4